Here are a few links to places to get information on the world of Azeroth and the peoples/quests/items found there in. I also will throw in links to a couple of sites for places with a large collection of mods for WOW, information on creating mods, and macros as well.
Great place to find out how to get in good with those other groups and factions that exist in the world of Azeroth, and what your potential rewards are for doing so.